Sometimes, things can hurt a lot (physically or mentally), but the result is worth it, and that is so much bigger than the pain. There's no comparison of the momentary (well, not momentary, more like day's worth) pain of childbirth to the lifetime of joy that a baby, a son or daughter brings into the world.
The same is true with love. Getting your heart broken or losing someone you love brings excruciating pain mentally. But if your love died and you were asked if you would go through it all again even knowing you'll come to the same end, with the same pain, you would do it again in a heartbeat.
